5

W₅

开采区域内构造引起的

应力增量与正常应力值之比/ $\gamma =\left({\sigma }_g-\sigma \right)/\sigma$

g ≤ 10%

0

1

10% < g ≤ 20%

1

20% < g ≤ 30%

2

g > 30%

3

6

W₆

煤的单轴抗压强度/Rc

Rc ≤ 10 MPa

0

1

10 MPa < Rc ≤ 14 MPa

1

14 MPa < Rc ≤ 20 MPa

2

Rc > 20 MPa

3

7

W₇

煤的弹性能指数/W_ET

W_ET < 2

0

1